Android tcpdump抓包應用實現

Android應用很多時候都會涉及到網路，在請求網路出錯時，我們可以通過抓包來分析網路請求，返回的資料等，通常我們是用tcpdump這個工具來抓包，再通過wireshark工具來分析產生的檔案，關於tcpdump的使，可以從網上查一下，有很多介紹，比如：http://www.cnblogs.com/likwo/archive/2012/09/06/2673944.html。關於如何用wireshark來分析檔案，本文不作介紹。

使用adb的命令來操作，還是比較麻煩，所以我寫了一個應用，把這些命令封裝了起來。實現的最根本的原理是通過Runtime.exec來執行linux命令。

運行

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實現代碼 CommandsHelper.java<喎?http://www.bkjia.com/kf/ware/vc/" target="_blank" class="keylink">vc3Ryb25nPgo8cHJlIGNsYXNzPQ=="brush:java;">/** * * @author lihong06 * @since 2014-3-3 */public class CommandsHelper { private static final String NAME = "tcpdump"; private static final String TAG = "CommandsHelper"; public static final String DEST_FILE = Environment.getExternalStorageDirectory() + "/capture.pcap"; public static boolean startCapture(Context context) { InputStream is = null; OutputStream os = null; boolean retVal = false; try { AssetManager am = context.getAssets(); is = am.open(NAME); File sdcardFile = Environment.getExternalStorageDirectory(); File dstFile = new File(sdcardFile, NAME); os = new FileOutputStream(dstFile); copyStream(is, os); String[] commands = new String[7]; commands[0] = "adb shell"; commands[1] = "su"; commands[2] = "cp -rf " + dstFile.toString() + " /data/local/tcpdump"; commands[3] = "rm -r " + dstFile.toString(); commands[4] = "chmod 777 /data/local/tcpdump"; commands[5] = "cd /data/local"; commands[6] = "tcpdump -p -vv -s 0 -w " + DEST_FILE; execCmd(commands); } catch (IOException e) { e.printStackTrace(); Log.i(TAG, " error: " + e.getMessage()); } finally { closeSafely(is); closeSafely(os); } return retVal; } public static void stopCapture(Context context) { // 找出所有的帶有tcpdump的進程 String[] commands = new String[2]; commands[0] = "adb shell"; commands[1] = "ps|grep tcpdump|grep root|awk '{print $2}'"; Process process = execCmd(commands); String result = parseInputStream(process.getInputStream()); if (!TextUtils.isEmpty(result)) { String[] pids = result.split("\n"); if (null != pids) { String[] killCmds = new String[pids.length]; for (int i = 0; i < pids.length; ++i) { killCmds[i] = "kill -9 " + pids[i]; } execCmd(killCmds); } } } public static Process execCmd(String command) { return execCmd(new String[] { command }, true); } public static Process execCmd(String[] commands) { return execCmd(commands, true); } public static Process execCmd(String[] commands, boolean waitFor) { Process suProcess = null; try { suProcess = Runtime.getRuntime().exec("su"); DataOutputStream os = new DataOutputStream(suProcess.getOutputStream()); for (String cmd : commands) { if (!TextUtils.isEmpty(cmd)) { os.writeBytes(cmd + "\n"); } } os.flush(); os.writeBytes("exit\n"); os.flush(); } catch (IOException e) { e.printStackTrace(); } if (waitFor) { boolean retval = false; try { int suProcessRetval = suProcess.waitFor(); if (255 != suProcessRetval) { retval = true; } else { retval = false; } } catch (Exception ex) { Log.w("Error ejecutando el comando Root", ex); } } return suProcess; } private static void copyStream(InputStream is, OutputStream os) { final int BUFFER_SIZE = 1024; try { byte[] bytes = new byte[BUFFER_SIZE]; for (;;) { int count = is.read(bytes, 0, BUFFER_SIZE); if (count == -1) { break; } os.write(bytes, 0, count); } } catch (IOException e) { e.printStackTrace(); } } private static void closeSafely(Closeable is) { try { if (null != is) { is.close(); } } catch (IOException e) { e.printStackTrace(); } } private static String parseInputStream(InputStream is) { InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line = null; StringBuilder sb = new StringBuilder(); try { while ( (line = br.readLine()) != null) { sb.append(line).append("\n"); } } catch (IOException e) { e.printStackTrace(); } return sb.toString(); }}
MainActivity.java

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                final TextView textView = (TextView) findViewById(R.id.textView1);        String oldText = textView.getText().toString();        textView.setText(oldText + "\n\n" + "目標檔案： " + CommandsHelper.DEST_FILE);                findViewById(R.id.start_capture).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                v.setEnabled(false);                new Thread(new Runnable() {                    @Override                    public void run() {                        final boolean retVal = CommandsHelper.startCapture(MainActivity.this);                        runOnUiThread(new Runnable() {                            @Override                            public void run() {                                Toast.makeText(MainActivity.this, "startCapture result = " + retVal, Toast.LENGTH_SHORT).show();                            }                        });                    }                }).start();            }        });                findViewById(R.id.stop_capture).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                CommandsHelper.stopCapture(MainActivity.this);                findViewById(R.id.start_capture).setEnabled(true);            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

說明1、手機必須要Root，沒有root的我沒有測試過，另外，我也只測試了我一台手機，沒有覆蓋到所有的手機。2、大家如果發現問題，請告知於我，謝謝。